WARRANTS (Tables)

6 Months Ended

Jun. 30, 2019

Warrants and Rights Note Disclosure [Abstract]

Schedule of warrant activity

A roll-forward of warrant share activity from January 1, 2018 to June 30, 2018 is shown in the following table:

	Issued and Outstanding Warrants as of January 1, 2018	Warrants Exercised/ Expired			Issued and Outstanding Warrants as of June 30, 2018
Bridge Warrants	249,999	(249,999	)	(1)	—
Consulting Warrants	12,223	(5,556	)	(2)	6,667
Financing Warrants	62,530	—			62,530
Underwriting Warrants	310,500	—			310,500
IR Consulting Warrants	6,000	—			6,000
Private Placement Warrants - 2016	891,063	(73,000	)	(3)	818,063
Underwriting Warrants - Public Offering 2016	122,175	—			122,175
Private Placement Warrants - September 2017	1,976,919	(10,600	)	(4)	1,966,319
Placement Agent Warrants	98,846	—			98,846
	3,730,255	(339,155	)		3,391,100

(1) During the six months ended June 30, 2018, there were 249,999 warrants that were exchanged for 242,913 shares of common stock in an exchange transaction where the warrant holders exchanged the warrants for the same number of shares they would have been entitled to in a cashless exercise.

(2) During the six months ended June 30, 2018, there were 5,556 warrants that were exercised through a cashless exercise which netted 5,542 shares being issued.

(3) During the six months ended June 30, 2018, there were 73,000 warrants exercised for cash.

(4) During the six months ended June 30, 2018, there were 10,600 warrants exercised for cash.

A roll-forward of warrant share activity from January 1, 2019 to June 30, 2019 is shown in the following table:

	Exercise Price	Expiration Date	Issued and Outstanding Warrants as of January 1, 2019	Warrants Exercised/ Expired			Issued and Outstanding Warrants as of June 30, 2019
Consulting Warrants	$0.01	6/17/2020	6,667	—			6,667
Financing Warrants	$3.35	6/17/2020	62,530	—			62,530
Underwriting Warrants	$7.50	5/28/2019	310,500	(310,500	)	(1)	—
Private Placement Warrants - 2016	$2.86	4/25/2019	818,063	(818,063	)	(2)	—
Underwriting Warrants - Public Offering 2016	$4.25	9/9/2019	122,175	—			122,175
Private Placement Warrants - September 2017	$4.85	9/28/2020	1,966,319	—			1,966,319
Placement Agent Warrants	$4.85	9/28/2020	98,846	—			98,846
			3,385,100	(1,128,563	)		2,256,537

(1) During the six months ended June 30, 2019, there were 310,500 warrants that expired.

(2) During the six months ended June 30, 2019, there were 485,000 warrants exercised for cash, 44,928 warrants that were exercised through a cashless exercise which netted 1,809 shares being issued and 288,135 warrants that expired.